package com.TT.ticket.add;

import java.util.concurrent.CountDownLatch;

/**
 * 计数器
 */
public class CountDownLatchDemo {

    public static void main(String[] args) throws InterruptedException {
        //总数是6
        CountDownLatch countDownLatch = new CountDownLatch(6);

        for (int i = 0; i < 5; i++) {
            new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + " Go out");
                countDownLatch.countDown(); //数量-1
            }, String.valueOf(i)).start();
        }

        countDownLatch.await(); //等待计数器归零，然后再向下执行

        System.out.println("Close...");

    }

}
